71899990 has 32 divisors (see below), whose sum is σ = 140940000. Its totient is φ = 26304768.

The previous prime is 71899973. The next prime is 71900051. The reversal of 71899990 is 9999817.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (4404375).

Almost surely, 2^71899990 is an apocalyptic number.

71899990 is a deficient number, since it is larger than the sum of its proper divisors (69040010).

71899990 is a wasteful number, since it uses less digits than its factorization.

71899990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13104.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 71899990 is about 8479.3861806147. The cubic root of 71899990 is about 415.8240557428.

The spelling of 71899990 in words is "seventy-one million, eight hundred ninety-nine thousand, nine hundred ninety".